actually here in Canada we study and research this to death.

Hell...I gre up on a farm....understanding the ratio of the amount of kj (kilojoules) of total consumed energy vs the inevitable output of available energy as end product .

Ie : meat and milk.

The amount of kj of consumed resources by say a cow...to nurture it from infancy to maturity and the resultant meat it finally produces upon slaughter and process is vastly inefficient.
The same to nurture a milk producing cow from infancy to maturity...
the amount of output of kj of energy resource by the milking cow cannot ever pass the amount of energy it consumes on a daily basis.
It is a net loss...for the entire life of the milking cow.

Same with pigs...the amount of time and kj of resources to feed it to bring it to maturity and ready for slaughter is likewise, though it is not as pronounced a loss .

There are exceptions to this rule of kj consumed vs final kj output harvested.

Due to the minuscule (in compare to bovine and porcine) amount of consumption and due to the rapid maturity OF the great great great great great ~ nthn grandchildren OF the Tyrannosaurus...the humble chicken and turkey...
Chickens, Turkeys and their like...are more efficient.

As far as heavier meat animals, goats are pretty good...but consume more than chickens or turkeys...

Sheep consume more and put out less end product kj of meat.

But cows and pigs are the worst.

Smaller stock animals that have a short maturity time, that consume less, can put out decent return for the energy they consume.

It is just the law of energy return.

Dinosaurs are no different than say our elephants of today...
They consume a lot and in the end, the kj of energy return in meat compared to kj of energy in resources consumed always outweighs ...

What you want Dave ...to solve the food crisis our planet is now going through ....and will only get worse...btw...
is not dinosaurs...
But Mammoth sized chickens...
I don't think it wise though.
Even at their slight stature...have you ever seen a chicken size you up?
Look at you like it was wondering just how you would taste if say...you had a stroke and fell in the chicken coop and couldn't move?
[shudder]
I have seen that look every morning for many years...and it still gives me the willies sometimes...
Even though I have always become quite fond of my egg laying ladies...

But giant chickens would certainly....well ...hopefully...attain maturity rapidly and still output more kj of meat or eggs than kj or resources it consumes over its life...
As long as somehow the metabolic rate of growth is not slowed.

Here is a theoretical of what life would be like with giant food sources....feeding the planet.

https://www.youtube.com/watch?v=VfrShu_Lp2A